Shiphold mounting of elements adapted to work under torsion stress



May 29, 1956 KUMMERMAN 2,747,537

SHIPHOLD MOUNTING OF ELEMENTS ADAPTED TO WORK UNDER TORSION STRESS FiledNov. 18, 1952 2 Sheets-Sheet 1 INVEN TOR HENRI KUMM ERMN ATTORNEYS.

y 9, 1956 H. KUMMERMAN 2,747,537

SHIPHOLD MOUNTING OF ELEMENTS ADAPTED TO WORK UNDER TORSION STRESS FiledNov. 18, 1952 2 Sheets-Sheet 2 INVENTOR HENRI KUMMERMAN ATTORNEYS.

United States Patent SHI D NG 0F EMENT TO WORK UNDER TORSION STRESSHenri Kummerman, Nenilly-sur-Seine, France Application November 18,1952, Serial No. 321,127

Claims priority, application France March 13, 1952 4 Claims. (Cl.114-79) This invention relates to improvements in the construction offloors, platforms and the like structural assemblies and is particularlydirected to a novel and improved platform structure for a ship.

In accordance with the conventional manner of constructing a platform ordeck in a ships hull, the platform members or sections are directlysecured, either rigidly or hingedly to the walls of the hull of theship, brackets or gussets being used to secure the platform sections tothe walls of the hull. Such a construction results in the transmissionof bending stresses to the hull when vertical loads are placed on theplatform sections.

The primaryobject of the present invention is to provide a mountingarrangement for such platform or deck sections whereby the hull is freefrom receiving any undue bending stresses as a result of vertical loadsplaced on the platform sections.

Another object of this invention is to provide. a. Supporting beam forthe platform sections and to mount such a beam between adjacent,transverse bulkheads in the ships hull so that the beam extendsalongside but is spaced from the wall of the hull and supports theplatform sections in a manner so that any torsion stresses, imposed onthe beam by loads on the platform sections, are transmitted to thebulkheads and the hull itself is free from receiving bending stresses asa result of such loads.

Generally stated, the present invention comprehends the mounting of atubular beam in a position extending longitudinally alongside the wallof a hull by fastening the ends of the beam to a pair of adjacent,longitudinally spaced, transverse partitions or bulkheads in the hull.The beam is free of attachment to the wall of the hull and supports theplatform sections, which are preferably hinged thereto. The sections arepreferably hinged for vertical swinging movement from raised verticalpositions to lowered horizontal positions. In such latter positions,cooperative abutment means is provided between the beam and the platformsections. To prevent deflection of the beam and to maintain it straight,supports extend laterally from the wall of the hull and are positionedtransversely within the beam so that the beam can rest thereon but suchsupports carry no torsion stresses and such torsion stresses, whichbuild up in beam, are transmitted to the bulkheads.

These and ancillary objects and advantages are attained by thisinvention, the preferred form of which is set forth in the followingdescription and illustrated in the attached drawings, wherein:

Fig. l is a diagrammatic illustration of the principle underlying thepresent invention and shows the manner of mounting a beam so that it iscapable of withstanding torsion stresses;

Fig. 2 is a fragmentary perspective view of a ships hull with partsbroken away and shown in section to illustrate the mounting arrangementof this invention for the platform sections, and,

7 P 2,747,537 Ce Patented Mag 29 1956 Fig. 3 is a detailed.cross-sectional view of the beam showing h truc ural d a l h e ndthe mnner of s cur ng th p attnnn. se ions to the b mr na ne o n r cn ar y: te a he dra fis tte t n is irst ire tedrtoF- snr 1 or. an unde a g of hpr ncipl nnderlr ng th n e ti n n Fig. l, numeral 1. designatesanelongated tubular beam which is shown ascircular in cross section, butwhich an be of a ve ed cros e ional shape. ep nd n p n h oca on in w h.it is to e ou ted Fi s- 2 and 3 whereinthe beam 1 1 isof a modifiedtubular cross-sectional shape having top and bottom portions and t l stone side all. po tion).- The m 1 i fas ened t s nd t pl e 2 and. 3. w ica t s pp in members an hi h proie tla ra ly rom a upportin w he en o hehn n na! b emb d ed. in he plat i si ed-v Reint einar es 4 and 5 b t andce e: beam andnre ix l supe mpo ed an the inner faces of: the plates; 2and. 3, by rivets 6 or any er sui abl fa t ning; means As shawnn he d ains, to s str sse applie tax-the eam n, e dir st i h r w 1 l; be ransmited: byhe henna t0 e P t nd. 3.- a ng xis o t s or o eign. X-Xi- Th anyshear ng; tr sses wi l; he app e o th suppor ing m mbers; ennstitnten.by the pla e nd 3-.

In. F gs 2 nd i he an licatien e above hine nn l p inc n in the con rucon-0f. ap a fn ns r deck for the. nll a hip is shown As sho n n Fi 2 a3- h 1 8 h h s o conven ien l o trnstinn composed of side Wa ls. 9 hav nverti al ib e emen s 1%. onth nne surfac s- Bnlkh ads o P r i ions an 2(sho n. in. dot ed. nes.) e ten ransversely between, the. side a ls anda e. long ud nally sp ced apart.

The beam 1a extends longitudinally along the inside of the walls 9 andis fastened at its ends to the bulkheads 11 and 12. The beam is notchedout to receive the rib elements and is out of contact with the walls.The beam 1a is mounted in the manner shown in Fig. 1 or in a similarmanner so that its ends are secured to the bulkheads, which may, ifnecessary, be rigidified by gussets 13.

Platform sections or panels 14, which form the platform 15 are carriedby the beam and are secured thereto. Preferably, the sections 14 arehinged to the beam by hinge means 16 so that they can be positioned inraised vertical positions resting on top of the beam or in loweredhorizontal positions, as shown in Fig. 3. As shown therein, the loweredge 17 'of the inner hinged side of the platform sections abuts againsta bearing surface 18 defined by the lower edge of the outer side of thebeam.

The beam 1a has its open side facing the walls 9 and plates 19 projectlaterally from the wall and are disposed transversely within the beam.The plates 19 are welded, as at 20, to certain of the ribs 10 or may beotherwise fastened thereto. The plates fit within the beam 1a and aredisposed transversely thereof. The plates 19 do not receive anytorsional stress from the beam, such stresses being entirely transmittedto the bulkheads. The plates 19 are provided to ensure against bucklingor deflection of the beam and the distance of span of the beam willdetermine the number of such plates 19 to be provided. The plates are ofa shape complemental to the interior cross-sectional shape of the beam1a.

The platform sections or panels 14 are formed, at their longitudinalinner side edges, with lips or flanges 21 that are provided to supportremovable center sections 22. Thus, when the hinged sections or panels14 at each side of the hull are in lowered horizontal positions, thesections support the center sections 22.

beam having top and bottom portions, a platform section hingedly securedto the beam and disposed at the inner side thereof, hinge means securingsaid section to the beam for movement of the section from a raisedvertical position resting on top of the beam to a lowered horizontalposition extending laterally inwardly from the beam,cooperative'abutment means on the, beam and the section supporting thesection in a horizontal position and supporting means extendinglaterally inwardly from said side wall and disposed intermediate andimmediately adjacent said top and bottom portions and in unattachedrelationship therewith to prevent deformation of the beam, said beamtransmitting all torsional stresses imposed thereon by loads on theplatform section,'when such section is in a horizontal position, to thepartitions.

2. A platform structure as claimed in claim 1, wherein the ends of thebeam are embedded in the partitions.

3. In a shiphold having side walls and partitions secured transverselybetween the side walls and disposed in longitudinally spaced relation; aplatform or deck structure comprising a channel beam extending alongsidethe inside of the side walls in unattached relation therewith'andsecured solely at its ends to adjoining partitions said beams havingtop'and bottom portions and an inner side portion spaced from the saidwalls, a plurality of adjoining side platform sections secured in end toand adjoining relation to the beams, hinge means securing the sideplatform sections to the beams for movementthereof from raised verticalpositions resting on top of the beams to lowered horizontal positionsextending laterally inwardly from the beams, cooperative abutment meanson the inner side portions of the beams and on the side platformsections for supporting the side platform sections in horizontalpositions, supporting elements secured to the side walls and extendinglaterally inwardly from the side walls and disposed intermediate the topand bottom portions of the beams and in immediate adjacency to the topand bottom portions and the inner side portions and in unattachedrelationship therewith to prevent lateral and vertical deformation ofthe beams, said beams transmitting all torsional stresses imposedthereon by loads on the side platform sections, when the sections are inhorizontal positions, to the partitions.

4. A platform structure as claimed in claim 3, wherein said sideplatform sections'have inner side edges formed with means providingseats and removable center platform sections detachably seated on saidseats when the side platform sections are in lowered horizontalpositions.

References Cited in the file of thispatent UNITED STATES PATENTS

